Attachment 632035 Details for Bug 865380 – kernel module source

kernel module source

perfev.c (text/plain), 1.29 KB, created by Gleb Natapov on 2012-10-23 11:23:43 UTC

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Creator: Gleb Natapov

Created: 2012-10-23 11:23:43 UTC

Size: 1.29 KB

patch

obsolete

>/*
> * xxx
> */
>
>#include <linux/perf_event.h>
>
>static void perf_overflow_intr(struct perf_event *perf_event, int nmi,
>                struct perf_sample_data *data, struct pt_regs *regs)
>{
>}
>
>static int __init xxx_init_module (void)
>{
>	u64 counter, enabled, running;
>	struct perf_event *event;
>        struct perf_event_attr attr = {
>                .type = PERF_TYPE_HARDWARE,
>                .size = sizeof(attr),
>                .pinned = true,
>                .exclude_idle = true,
>                .config = PERF_COUNT_HW_INSTRUCTIONS,
>        };
>
>	attr.sample_period = 1000000;
>
>	printk("create event %p\n", perf_overflow_intr);
>	event = perf_event_create_kernel_counter(&attr, -1, current,
>			perf_overflow_intr, NULL);
>
>	if (IS_ERR(event)) {
>		printk("can't create event %ld\n", PTR_ERR(event));
>		return -EIO;
>	}
>
>	counter = perf_event_read_value(event, &enabled, &running);
>	printk("counter=%lld enabled=%lld running=%lld\n", counter, enabled, running);
>	udelay(10000);
>	counter = perf_event_read_value(event, &enabled, &running);
>	printk("counter=%lld enabled=%lld running=%lld\n", counter, enabled, running);
>
>	printk("release event %p\n", perf_overflow_intr);
>	perf_event_release_kernel(event);
>	printk("exit %p\n", perf_overflow_intr);
>
>	return -EIO;
>}
>
>module_init(xxx_init_module);
>
>MODULE_LICENSE("GPL");

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Attachments on bug 865380: 625475 | 627958 | 627959 | 632035 | 632179